Granulation system

Abstract

The utility model discloses a granulation system which comprises a paddle dryer, a granulation tower, a screening device and a first tail gas absorption device, a discharge port of the paddle dryer is communicated with a feed port of the granulation tower through a pipeline, a discharge port of the granulation tower is communicated with the screening device through a pipeline, and an exhaust port of the paddle dryer is communicated with the first tail gas absorption device through a pipeline. The granulation system disclosed by the utility model is used for carrying out continuous operation of drying, melting and granulation on wet solids such as long-chain dibasic acid, and particularly, a paddle dryer is used for replacing traditional kettle type melting equipment, so that drying and melting of the long-chain dibasic acid can be integrated, the wet solids are dried and melted in one equipment, the process flow can be shortened, and the production cost can be reduced. The production efficiency and the equipment utilization rate are improved, the traditional equipment investment for powder material conveying, storage and the like is saved, and the production cost is reduced. And the screening device arranged in the granulation system is used for screening the granulated particles, so that products with uniform particle size distribution can be obtained.

Description

[0001] This application is a divisional application with an application date of October 16, 2023, application number 202322762868.2 and name “A Granulation System”. Technical Field

[0002] The utility model belongs to the technical field of granulation, and in particular relates to a granulation system. Background Art

[0003] Long-chain dibasic acids are important raw materials for synthetic fragrances, nylon engineering plastics, hot melt adhesives, resins, cold-resistant plasticizers, medicines and pesticides. Its structural formula is HOOC(CH 2 )nCOOH, wherein n is an integer greater than 7.

[0004] The biological method for preparing long-chain dibasic acids has the characteristics of simple production process and green environmental protection. The fermentation broth needs to be filtered and decolorized for many times to remove impurities such as cell tissue, protein, pigment, etc. of the fermentation microorganisms, and then the long-chain dibasic acid is crystallized from the solution, and then separated by centrifugation or filtration and dried to form a powdered long-chain dibasic acid solid product. Since the powder formed by crystallization is fine, it is easy to form dust explosions when the operation is improper, especially during the weighting, filling and stirring process, which will cause the powder to fly. It not only pollutes the environment and worsens the working conditions, but also causes product loss and waste. Granular products of different particle sizes can be obtained by granulating the long-chain dibasic acid products to meet the needs of different customers. At present, the granulation of long-chain dibasic acids uses a melting kettle for batch granulation, specifically, the long-chain dibasic acid powder finished material with a water content of ≤0.5% is transported to the melting kettle for melting, and then transported to the granulation system for spraying. The current granulation method requires that the processed raw materials must be qualified finished products of long-chain dibasic acids, and the requirements for moisture content are relatively stringent. It is necessary to wait for a certain amount of dry products to be formed in the upstream drying section before melt granulation can be carried out. This batch processing method has a low equipment utilization rate and requires matching equipment such as transportation and storage of long-chain dibasic acid powder materials, which requires large equipment investment. Utility Model Content

[0005] The utility model aims to provide a granulation system to improve granulation efficiency and equipment utilization.

[0006] A granulation system comprises: a paddle dryer, a granulation tower, a screening device, and a first tail gas absorption device; the discharge port of the paddle dryer and the feed port of the granulation tower are connected through a pipeline, the discharge port of the granulation tower is connected to the screening device through a pipeline, and the exhaust port of the paddle dryer is connected to the first tail gas absorption device through a pipeline.

[0007] In one embodiment, the pipeline is provided with a valve and / or a melt pump.

[0008] After the wet solid raw material enters the paddle dryer, the wet solid is gradually heated, dried and dehumidified to form powder. As the temperature rises, the solid powder melts to form a melt.

[0009] The melt discharged from the paddle dryer is pumped to the feed port of the granulation tower through a pipeline, and is granulated into solid particles through the granulation tower.

[0010] The solid particles obtained by granulation have different particle sizes. After passing through the screening device, a solid particle product with a particle size distribution within a certain range is obtained.

[0011] In one embodiment, a solid particle product with a particle size of 15-45 mesh is obtained by a screening device.

[0012] In one embodiment, after being screened by the screening device, solid particles with a particle size not in the range of 15-45 mesh are transported to the feed port of the paddle dryer through a powder conveying device.

[0013] In one embodiment, the screening device is a vibrating screen.

[0014] In one embodiment, the powder conveying equipment includes any one of a screw conveyor and a tube chain conveyor.

[0015] In one embodiment, the granulation system comprises a second tail gas absorption device 5. The exhaust port of the granulation tower is connected to the second tail gas absorption device 5 through a pipeline.

[0016] In one embodiment, the first tail gas absorption device and the second tail gas absorption device 5 each independently include a dust removal device, a spray tower and a draft device which are connected in sequence.

[0017] The spray tower contains fillers and solvents capable of absorbing dust and odor. The gas discharged from the dust removal device is further treated by the spray tower to remove residual dust and odor.

[0018] In one embodiment, the number of the spray towers is 1, 2 or more than 3. The spray towers are interconnected through pipelines, and the spray tower at the end far from the dust removal device is connected to the air induced device through a pipeline.

[0019] In one embodiment, the dust removal device includes any one of a pulse dust collector and a bag dust collector.

[0020] In one embodiment, the induced draft device is an induced draft fan.

[0021] In one embodiment, the granulation system comprises a cooling device for cooling the solid particles obtained by the screening device 3 .

[0022] In one embodiment, the cooling device is an air cooler.

[0023] In one embodiment, the granulation system includes a decolorizing column, the discharge port of the paddle dryer is connected to the feed port of the decolorizing column through a pipeline, the discharge port of the decolorizing column is connected to the feed port of the granulation tower through a pipeline, and the decolorizing column contains a decolorizing agent. The decolorizing column is provided with a heating device to make the temperature in the decolorizing column above the melting point of the material to be decolorized.

[0024] Beneficial effects of the utility model:

[0025] The granulation system of the utility model performs continuous operations of drying, melting and granulation of wet solids such as long-chain dibasic acids, and in particular uses a paddle dryer to replace the traditional kettle-type melting equipment, which can integrate the drying and melting of long-chain dibasic acids into one, so that the wet solids can be dried and melted in one device, which can shorten the process flow, improve production efficiency and equipment utilization, save traditional powder material transportation, storage and other equipment investment, and reduce production costs. The screening device set in the granulation system screens the granulated particles to obtain products with uniform particle size distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Schematic diagram of the granulation system.

[0027] Figure numerals: 1-blade dryer, 2-granulation tower, 3-vibrating screen, 4-first exhaust gas treatment device, 41-pulse dust collector, 42-first spray tower, 43-induced draft fan, 5-second exhaust gas treatment device, 51-pulse dust collector, 52-second spray tower, 53-induced draft fan. DETAILED DESCRIPTION

[0028] The present invention will be further described in detail below in conjunction with specific embodiments. It should be understood that the following embodiments are only exemplary descriptions and explanations of the present invention and should not be interpreted as limiting the scope of protection of the present invention. All technologies implemented based on the above content of the present invention are included in the scope of protection of the present invention.

[0029] like Figure 1 As shown, the utility model provides a granulation system, comprising: a paddle dryer 1, a granulation tower 2, a screening device 3, and a first tail gas absorption device 4; the discharge port of the paddle dryer 1 and the feed port of the granulation tower 2 are connected through a pipeline, the discharge port of the granulation tower 2 is connected to the screening device 3 through a pipeline, and the exhaust port of the paddle dryer 1 is connected to the first tail gas absorption device 4 through a pipeline.

[0030] After the wet solid of the long-chain dibasic acid enters the paddle dryer 1 through the feed port, the wet solid is gradually heated, dried, and dehumidified to form a powder. As the temperature rises, the powder gradually melts to form a melt.

[0031] In one embodiment, the paddle dryer 1 is provided with two heating zones: a first heating zone (low temperature heating zone) and a second heating zone (high temperature heating zone), and the first heating zone and the second heating zone are connected. Under the driving action of the paddle, the wet solid of the long-chain dibasic acid passes through the first heating zone and the second heating zone in sequence. In the first heating zone, the wet solid is heated to 100°C-120°C for drying and dehumidification to form a powder, and then passes through the second heating zone, where the powder is heated to above the melting point to form a melt, and is pumped to the feed port of the granulation tower 2 through the discharge port.

[0032] During the heating process of the blade dryer 1, dust is easily generated in the internal space of the blade dryer 1 due to the pushing effect of the blades. The exhaust port of the blade dryer 1 is connected to the first tail gas absorption device 4 through a pipeline. The first tail gas absorption device 4 is a first dust removal device 41, a first spray tower 42 and a first draft device 43 which are connected in sequence. Under the action of the draft device, the dust-containing gas enters the first dust removal device 41 through the exhaust port of the blade dryer 1 to remove dust. The first spray tower 42 contains fillers and solvents that can absorb dust and odor. The gas discharged from the first dust removal device 41 is further treated by the first spray tower 42 to remove residual dust and odor. At the same time, the moisture in the blade dryer 1 is continuously discharged under the action of the first draft device 43, which improves the drying and melting efficiency of the blade dryer 1.

[0033] The discharge port of the paddle dryer 1 is located at the lower part of the paddle dryer 1. Figure 1 As shown, the melt is pumped to the feed port of the granulation tower 2 through the discharge port through a pipeline, and granulated into long-chain dibasic acid solid particles through the granulation tower 2. The long-chain dibasic acid solid particles obtained by granulation have different particle sizes, and after passing through the screening device 3, a solid particle product with a particle size distribution in a certain range is obtained.

[0034] In one embodiment of the present invention, the screening device 3 has more than two layers of screens, and the aperture of each layer of screens is different, thereby screening out solid particle products with a particle size within a certain range, thereby improving the uniformity of the product.

[0035] In one embodiment of the present invention, after screening by the screening device 3, a solid particle product with a particle size of 15-45 mesh is obtained.

[0036] In one embodiment of the utility model, solid particles whose particle size does not meet the requirements are transported to the feed port of the paddle dryer 1 through a powder conveying device. The solid particles that do not meet the particle size requirements are transported back to the paddle dryer 1 for melting, and then granulated by the subsequent granulation tower 2 and screened by the screening device 3, thereby improving the granulation completion rate and product yield.

[0037] In one embodiment of the present invention, the powder conveying equipment is a screw conveyor.

[0038] In another embodiment of the present invention, the powder conveying equipment is a tube chain conveyor.

[0039] In one embodiment of the utility model, the granulation tower 2 is separately equipped with a set of tail gas absorption device, namely, the second tail gas absorption device 5. The second tail gas absorption device 5 is a pulse dust collector 51, a second spray tower 52 and an induced draft fan 53 which are connected in sequence. The exhaust port of the granulation tower 2 is connected to the second tail gas absorption device 5 through a pipeline. The pulse dust collector 51 can remove dust in the gas, and the second spray tower 52 contains fillers and solvents that can absorb dust and odor. The gas discharged from the dust removal device is further removed from the residual dust and odor after being processed by the spray tower. In addition, the presence of the induced draft fan 53 is conducive to the melt in the granulation tower 2 to cool down quickly to form particles under the action of the airflow.

[0040] In one embodiment of the present invention, an air induction system is provided on the top of the granulation tower 2. The airflow generated by the air induction system is conducive to the rapid cooling of the melt in the granulation tower 2 to form particles.

[0041] In one embodiment of the utility model, the granulation system includes a decolorization column, which is arranged between the paddle dryer 1 and the granulation tower 2, and the discharge port of the paddle dryer 1 is connected to the feed port of the decolorization column through a pipeline, and the discharge port of the decolorization column is connected to the feed port of the granulation tower 2 through a pipeline. The decolorization column contains a decolorant. The decolorization column is provided with a heating device such as a heating jacket to make the temperature in the decolorization column above the melting point of the long-chain dibasic acid.

[0042] The melt discharged from the paddle dryer 1 is transported to the decolorizing column and flows through the decolorizing column. The melt flowing out of the decolorizing column is pumped to the feed port of the granulation tower 2. The melt contacts the decolorizing agent in the decolorizing column so that the impurities in the melt are adsorbed by the decolorizing agent, and a high-purity product is obtained through granulation. Since the molten material discharged from the paddle dryer 1 has the characteristics of fluidity and high temperature, it flows through the decolorizing column in the form of a melt, which reduces the heating energy consumption and has a good impurity removal effect.

[0043] In one embodiment of the present invention, the dust removal device is a pulse dust collector.

[0044] In one embodiment of the present invention, the dust removal device is a bag dust collector.

[0045] In one embodiment of the present invention, the air induced device is an induced draft fan.

[0046] In one embodiment of the present invention, the screening device 3 is a vibrating screen.

[0047] In one embodiment of the utility model, the granulation system includes a cooling device for cooling the solid particles obtained by the screening device 3. The cooling device can accelerate the cooling speed of the solid particles, which is convenient for subsequent packaging. Especially in the summer when the temperature is high, the waiting time for cooling and packaging can be greatly shortened. The generation of condensate after high-temperature packaging is avoided.

[0048] In one embodiment of the present invention, the cooling device is an air cooler.

[0049] The equipment involved in the utility model are all existing devices.

[0050] The technical solution of the utility model is further explained below in conjunction with specific embodiments

[0051] Example 1

[0052] The raw material is a wet solid containing decacarbonyl dibasic acid (also known as sebacic acid). The preparation method refers to the patent publication number CN114249645A, and the wet solid washed with deionized water in step c) is used as the raw material.

[0053] use Figure 1 The granulation process of the granulation system shown is as follows:

[0054] The wet solid of deca-dicarboxylic acid (water content is 5wt%) is added to the paddle dryer 1 through the feed port of the paddle dryer 1, and dried and melted in the paddle dryer 1. Under the driving action of the paddle, the wet solid of deca-dicarboxylic acid first passes through the low temperature heating zone of the paddle dryer 1, the temperature of the low temperature heating zone is 110°C, the wet solid of deca-dicarboxylic acid is dried in the low temperature heating zone, the first heating zone and the second heating zone are connected, and the solid powder of deca-dicarboxylic acid continues to enter the high temperature heating zone under the driving action of the paddle, the heating temperature of the high temperature heating zone is above the melting point of deca-dicarboxylic acid, the solid powder of deca-dicarboxylic acid is heated and melted in the high temperature heating zone to form a melt, and the melt is discharged through the discharge port of the paddle dryer 1 and pumped to the feed port of the granulation tower 2. The solid particles of deca-dicarboxylic acid obtained by granulation in the granulation tower 2 are discharged outside the discharge port and fall into the vibrating screen 3 below the granulation tower 2, and the solid particle product with a particle size of 15-45 mesh is obtained after screening by the vibrating screen 3.

[0055] The exhaust port of the blade dryer 1 is connected to the tail gas treatment device through a pipeline, and the tail gas treatment device is a pulse dust collector 41, a first spray tower 42 and an induced draft fan 43 connected in sequence through pipelines. The gas containing dust enters the pulse dust collector 41 to remove dust. The first spray tower 42 contains fillers and solvents that can absorb dust and odor. The moisture in the blade dryer 1 is continuously discharged under the action of the induced draft fan 43.

[0056] The exhaust port of the granulation tower 2 is connected to the second tail gas absorption device 5 through a pipeline. The second tail gas absorption device 5 is a second dust removal device 51, a second spray tower 52 and a second draft device 53 which are connected in sequence. The gas discharged from the granulation tower contains dust, which is first removed by the second dust removal device 51. The second spray tower 52 contains fillers and solvents that can absorb dust and odor. The gas discharged from the dust removal device is further treated by the spray tower to remove residual dust and odor.

[0057] The particle size distribution of the decacarbonyl dibasic acid product in Example 1 is uniform, and particles with a particle size of 15-45 mesh account for 99.5wt%.

[0058] The above describes the implementation methods of the present invention. However, the present invention is not limited to the above implementation methods. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A granulation system, characterized in that: include: A paddle dryer (1), a granulation tower (2), a screening device (3), and a first tail gas absorption device (4); the discharge port of the paddle dryer (1) and the feed port of the granulation tower (2) are connected via a pipeline, the discharge port of the granulation tower (2) and the screening device (3) are connected via a pipeline, and the exhaust port of the paddle dryer (1) and the first tail gas absorption device (4) are connected via a pipeline; The first tail gas absorption device (4) comprises a first dust removal device (41), a first spray tower (42) and a first air induction device (43) which are connected in sequence; The granulation system comprises a second tail gas absorption device (5), and the second tail gas absorption device (5) comprises a second dust removal device (51), a second spray tower (52) and a second air induction device (53) which are connected in sequence.

2. The granulation system according to claim 1, characterized in that: After screening by the screening device (3), a solid particle product with a particle size of 15-45 mesh is obtained.

3. The granulation system according to claim 1 or 2, characterized in that: After being screened by the screening device (3), the solid particles with a particle size not exceeding 15-45 mesh are transported to the feed port of the paddle dryer (1) through the powder conveying equipment.

4. The granulation system according to claim 1, characterized in that: The granulation system comprises a decolorizing column, the discharge port of the paddle dryer (1) is connected to the feed port of the decolorizing column through a pipeline, the discharge port of the decolorizing column is connected to the feed port of the granulation tower (2) through a pipeline, and the decolorizing column contains a decolorizing agent.

5. The granulation system according to claim 4, characterized in that: The decolorizing column is provided with a heating device to make the temperature inside the decolorizing column higher than the melting point of the material to be decolorized.

6. The granulation system according to claim 2, characterized in that: It also comprises a cooling device for cooling the solid particles obtained by the screening device (3).

7. The granulation system according to claim 1, characterized in that: The dust removal device (41) includes a pulse dust collector and a bag dust collector.

8. The granulation system according to claim 3, characterized in that: The powder conveying equipment includes a screw conveyor and a tube chain conveyor.

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